The particle size distribution of coal gangue after ball milling is shown in Figure 2. The ground coal gangue can increase the specific surface area of the particles, significantly improve the gel activity, and facilitate the dissolution of the reaction process, which is the basis for the preparation of geopolymers. ... Future research will ...
1. Introduction. In coal mining, gangues which are piled up on the surface after discharge pose a threat to the environment around mining areas [1], [2], [3], [4].Coal mining by solid backfill mining technology, as a green mining method was proposed to solve problems such as pressed coal and gangue deposition presented by traditional mining technologies [5], [6], [7].
Published 28 Sept 2021 Abstract Coal gangue, an industrial waste, is rich in silicon and aluminum phase and may be used as a mineral admixture in concrete after moderately stimulating activity, allowing for efficient solid waste utilization.
Glassceramics with high strength and lightweight were developed by comprehensively utilizing coal gangue and clay. This work optimized the many processing parameters including the rate of using coal gangue, coal gangue to clay ratio, mineralizers, and process of forming and sintering. ... ballmilling and drying parameters of the mixtures, the ...
In the process of ball milling, gangue particle size is continuously reduced by the three interaction effects of impact, ... Zhang Y, Ling T C. Reactivity activation of waste coal gangue and its impact on the properties of cementbased materialsa review[J]. Construction and Building Materials, 2020, 234: 117424.
1. Introduction. Coal gangue is an industrial solid waste produced by coal mining and processing [13].The average production of gangue accounts for 1015% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in present, utilization ratio of coal gangue can reach about 60% in some countries.
To reveal how CaF 2 improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF 2 and hydrochloric acid are used to extract Al 3+ and Fe 3+ from the coal gangue calcined powder. The leaching ratios of Al 3+ and Fe 3+ are measured, and the filter residues are analyzed by BET, XRD, and SEM. The results show that adding 3% CaF 2 could increase the extraction ratio of Al 3+ from ...
Along with the excavation and washing of coal in the production process, large amounts of rocklike coal gangue (CG) accompanying the carboniferous beds are discharged as industrial residues, accounting for around 1020% of the coal production [2,3,4].In the largest coal production country, namely China, more than 700 million tons of coal gangue was expected in 2020, with the annual rate of ...
Crushing, a form of comminution, one of the unit operations of mineral processing. In the field of extractive metallurgy, mineral processing is the process of separating commercially valuable minerals from their ores. [1] Depending on the processes used in each instance, it is often also known as ore dressing or ore milling .
However, few reports are documented that explain the crushing of coal gangue under the action of the crushing device. ... In the process of ball milling, gangue particle size is continuously reduced by the three interaction effects of impact, extrusion and friction with the grinding medium [46, 47]. While in ball milling, as the particle size ...
Introduction In recent years, with the largescale mining of coal resources, a large amount of coal gangue is produced and accumulated on the surface. Gangue has become a serious scientific and engineering issue in the current environment of green mining.
To study the heterogeneity and local heterogeneity of gangue particle size distribution (PSD) under ball milling, gangue from northern Shaanxi coal mine was taken as a research object.
Using coal gangue (CG) as supplementary cementitious materials (SCMs) is believed to be one of the effective strategies for CG disposal. ... 60, and 120 min, respectively. This evidences directly the effect of the wetmilling process that the pozzolanic reactivity of CG was enhanced after wetgrinding. Download : Download highres image (573KB ...
Coal gangue crushing production line process and equipment configuration. Coal gangue crushing production line process and equipment configuration. Skip to content. ; info; gongyi city, henan province, China; Search. Search. Close this search box. Jaw Crusher; Cone Crusher; Sand Making Machine; Hammer Crusher;
Afterwards, the underlying mechanisms about the effects of calcined gangue and wet comilling on the hydration process, strength development and microstructure evolution of PESCM were explored and discussed in depth. ... Utilization of solid waste highvolume calcium coal gangue in autoclaved aerated concrete: Physicomechanical properties ...
Abstract The amount of coal gangue, a byproduct of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal gangue without appropriate utilization has resulted in a squander of resources, waste disposal and environmental pollution issues.
Consequently, the coalgangue recognition, i. e, detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving process, should be researched to realize the ...
Activation of coal gangue is necessary as kaolinite, the major aluminumcontaining component, is chemically inert. Thermal activation is a common method by which coal gangue has been activated that is simple to implement but relatively inefficient. The percentage recovery of alumina after thermal activation typically fails to reach 70% [8].
Xueyang,, Add to Mendeley https://// Get rights and content • Facile onestep synthesis of coal ganguemodified biochar for the removal of phosphate. • Coal gangue modified oilseed rape straw biochar show the best adsorption performance. •
Introduction As the main fossil energy and the main driving force of economic and social development, largescale mining and utilization of coal resources are accompanied by the continuous production of coal gangue with an output of 800 million to 1 billion t/a.
The invention relates to asuperwet coal gangue and loess combined pretreatment facility and a superwet coal gangue and loess combined pretreatment facility process, belongsto pretreatment facilities and pretreatment processes of paste filling raw materials. The facility is structurally characterized in that a loess metering feeder is arranged below a loess raw material cabin; a coal ...
Coal gangue, a solid waste of coal mining accounts for 1520% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the existing gangue backfilling methods, their working principles, efficiency, and application status.
The calorific value of the coal gangue was increased from about 1500kcal/kg to 4800 kcal/kg by the separation process. And about 30% product yield was obtained by the separation process. The product was used as steam coal which increased the revenue of the coal preparation plant and improved resource utilization. Conclusions
Filling of gangue formed in coal mining is an effective means to realize green mining in coal mine. The key of gangue filling mining is to accurately understand the breaking mechanism and pore evolution of gangue under load. Therefore, in this paper, firstly, the yield criterion of granular materials based on radius of curvature and contact stress is built, which concluded that the change of ...
To realize the recycling of coal gangue and obtain high valueadded products, highly porous mullite whisker ceramic microfiltration membranes for the treatment of emulsified oily wastewater were prepared using Al(OH) 3 and coal gangue as primary materials and MoO 3 as the additive. By a comparative study on the ceramic membranes with and without MoO 3 addition, the sintering reaction process ...
Coal gangue is one of the industrial solid wastes that may harm the human body through the ecosystem for a long time. Using coal gangue in geopolymer preparation can effectively reduce cement output and meet the sustainability requirements. In this paper, the physical and chemical characteristics, including the heavy metal content, of coal gangue from different producing areas are described.
Taking kaolinite as an example, A novel process to prepare aluminumsulfuric acid coagulant is examined by the highenergy ball milling activation of Coal gangue, followed by cogrinding with concentrated sulfuric acid, instead of the traditional hightemperature activated acidalkali process. The prepared coagulant is characterized by Xray diffraction (XRD), transmission electron microscope ...
Analysis of Influencing Factors of Gangue Ball Milling Based on Multifractal Theory Lei Zhu 1, Wenzhe Gu 2,*, Fengqi Qiu 1 and Peng Zhang 1 1 China Coal Energy Research Institute, Xi'an 710054 ...
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